20252281 has 8 divisors (see below), whose sum is σ = 23538240. Its totient is φ = 17064528.

The previous prime is 20252279. The next prime is 20252293. The reversal of 20252281 is 18225202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20252281 - 2¹ = 20252279 is a prime.

It is a super-2 number, since 2×20252281² = 820309771405922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20252231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24106 + ... + 24931.

It is an arithmetic number, because the mean of its divisors is an integer number (2942280).

Almost surely, 2^20252281 is an apocalyptic number.

It is an amenable number.

20252281 is a deficient number, since it is larger than the sum of its proper divisors (3285959).

20252281 is an equidigital number, since it uses as much as digits as its factorization.

20252281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49103.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20252281 is about 4500.2534373077. The cubic root of 20252281 is about 272.5783227432.

Adding to 20252281 its reverse (18225202), we get a palindrome (38477483).

The spelling of 20252281 in words is "twenty million, two hundred fifty-two thousand, two hundred eighty-one".